The breath passes slowly through one nostril and then the other.
Feel gravity: let your weight drop into your feet or the seat. Feel your weight being held by the seat or the ground.
Close the right nostril with your thumb. Breathe in through the left.
Close the left, open the right. Breathe out through the right.
Breathe in through the right; switch; breathe out through the left.
Continue this cycle, calmly, without hurrying.